Brake shoe treating apparatus



Dec. 4, 1951 s. P. LOWE BRAKE SHOE TREATING APPARATUS Filed Jan. 27, 1947 @d/uw Pfawa Patented Dec. 4, 1951 UNITED STATES PATENT OFFICE i I 2. 571534 nnAxnsnop TREATING APPARATUS Sydney P. Lowe, Columbus, Ohio Application January27, 1947, Serial N 0.724532 This invention relates to special dimension dressing or configuring of arc surfaces. This invention has utility when incorporated in apparatus for acting upon the working face side of brake shoes. The cutting or dressing operationmay be upon the face proper forremoving irregularities, for truing, as well as upon the lining and the final finishing or burnishing thereof.

Referring to the drawings:

Fig. 1 is a plan view, with parts .broken away, of an embodiment of the invention adapted for readily handling a wide range of sizes or dimensions of brake shoes, as for motor vehicles, the working tool herein being a rotary cutter;

Fig. 2 is a partial view from the line 11-11,

Fig. 1, on a larger scale, and in engaged instead of release position, for the worm gear transmission control means;

Fig. 3 is a side elevation, with some portions in section, of the apparatus ofFig. 1, however, here equipped with. an abrader tool, and the turret at mid position, instead of askew as in Fig. l; and

Fig. 4 is a vertical section thru a portion of the. turret mounting on the line .IV-IV, Fig. 3.

The rotary tool .A machine base I has a switch 2 which. is adapted to be thrown to closed position to operate a motor -3 in the base I (Fig. 3). Rising from the base I, in alignment with the axis of the motor 3 is a column or sleeve 4 for a motor shaft 5 to connect directly to the motor and. on a vertical axis, a work treating member, as a burnisher B, or in substitution therefor. acutter l.

The turret mounting Extending radially away from the column 4, the top of the base I has adovetail guide or way 8 (Fig. 4). A complementary dovetail 9 provides a directing way for a slide 19.. Centrally thru the slide Ill and in a radial direction toward the column A is an internally threaded. way or long nutlike portion ll for a screw stem (2'. Remote from the column 4 and beyond the opposite end of the base i, is a crank or handle 13 fixed with the stem !2. Turning of this crank l3 clockwise causes the slide to be. moved away from the column 4, while counterclockwise turning, of the crank i3 causes the slide Hi to be moved toward the column 4, along the course of thecooperating dovetail means 8, 9. Terminally flanges [4,; 15, fixed with. the stem or shaft !2 are .onxopposite sides of a bearing: IE on the base I, and cooper,- ate to hold the stem l2 from longitudinal movement in its rotation. i

Screws I! (Fig. 4) assemble a frame plate IE on the top ofv the slide l9. Rising from the outer portion of the plate 18, is a housing portion or flange l9. Centrally of the plate 48 and over the way H is an opening into which a reduced end portion 2| of a vertical shaft or turret axis member 22 may be riveted. The shaft 22 is normally non-rotary as to its mounting on the base and is, parallel to the column 4. The rotation of the crank l3 serves to adjust or change the distance between the turret axis member 22 and the axis of the rotary tool 6 or I.

The turret oscillate)- Concentric with the shaft 22, the flange [9 has a top bearing 23 for a-cover plate 24. Parallel to a diameter for the shaft 22,. the plate 2-4 has a dovetail track or way 25 with which may cooperate complementary dovetail way 26v of a secondary slide 21 having a slot clearance 28 (Fig. l) to permit shifting of this slide 21 relatively to the turret axis 22. Bolts 25! (Fig. 3.) mount an extension arm or handle 30 fixed with the slide .21. This provides a manual meansfor direct oscillation for the turret.

Supplementally a slower speed steady positive hold-in for swing control is provided. Between the plates I8, 24, in the housing 19 is a worm gear transmission. A bearing flange 3! (Fig. 4.) on the plate l8, has a sleeve riser 32 therefrom about the shaft '22 and loose thereon. From the upper portion of the sleeve 3-2 there is a worm gear 33 connected by bolts 36- with the plate 24. The bearing [8, 3!, may really carry the turret load, instead of on the bearing 23 at the plate 24.

In the housing l9 near the plate 58-, bearings position a rock shaft 35 which has a riser arm 31 connected to a worm 38, and an angle lever arm 39 also connected to the worm 38-. A second arm 40 connected to the angle lever 39, extends thru a window or slot M in the housing l9. At a pivot bearing 42 on the housing I!) adj'acent the window 41- is a lever or trigger t. A lug 44 extending upward from the bearing 62 (Fig. 2) directs a compression helical spring 45 against upper arm 41 of the trigger to swing the trigger G3 which has a lower portion on which an offset or lug 43 serves as a catch under the arm 40 to hold the worm 38 in mesh relation with the worm wheel or gear 33-. From the worm 38 is a shaft 49 through a slotted in the housing l9 to a crank; 5 l By shifting the trigger 43 anddepresswingrthe handle 49, the trigger as releasedwill have the-lug 48. ride on the. handle 40 and hold the r .worm 38 out of mesh with the gear 33.

The work support Adapted to engage the plate or slide 21 is a main bolt 52 (Fig. 1) for a brake shoe support 53. Remote from the bolt 52, a second bolt 54 engages in a slot 55 to lock the support 53 with the slide 21. The support 2'! has arc end ears 56 upon which may rest end portions of a brake shoe 5'! for its medial inward flange 58 to rest on pins 59 which may be adapted to the work 51 by placing in proper holes 60 therefor. A central projection 6| supports the shoe 5'! medial portion and a clamp finger 62 may be locked by a bolt 63.

The slot 55 is a provision for adjusting the free or normally thrown end of a brake shoe as to the relatively fixed mounting of the location at the bolt 52. Against the support 53 near the bolt 54 is a screw 64 rotatable in a lug 65 rising from the slide 21. head 66 for manual setting of the screw 64 to thrust the support 54 outward into a desired region for proper action of the rotary tool 6 or 1. upon the work 51. When so adjusted by the screw 64, the bolt 54 may be tightened, thus to lock the work support with the turret.

The turret working radius control While the operation of the crank l3 provides positive means for changing the axis of the turret in its spacing from the rotary tool, such setting is in approximation of the range for the particular work undertaken, as well as direct throwing in and out. However, for nicety in control during the brake face treating, automatic control means is provided herein.

The upper side of the plate or slide 21 has bolt-holding slots 61 in the direction of the dovetail way 25, 26, for bolts 68 to look a control plate 69 having a clearance slot 10 of greater extent than the slot 28 of the plate 21 as to the shaft 22.

It is in order to follow the general range setting as efiected by the stem 12, in causing the plate 69 to be adjusted on the slide 21 to have index H (Fig. 3) tally with an appropriate graduation 12 for the work diameter adopted. The bolts 68 are then. tightened. The slide 2'! and the control plate 69 are now assembled to operate as a unit.

Rising from the plate 69 is a bracket 13 carrying at its top a roller 14 as a control feeler. The shaft 22 in its upward extent from the turret, has a pair of brakedrum hub fitting cones 15 adapted to be adjusted by a nut 16 to mount a brake drum IT as a master pattern on the shaft 22. The drum I! is coaxial with the turret. For the item of work to be undertaken, the feeler roller I4 is disposed to ride on the drum brake surface or interior.

Flexibility to permit the feeler 74 to respond to special conditions of departure are provided. The slide 2'! is not fixed or rigid with the cover or' plate 24.. Parallel to the dovetail way 25, 26, and the slots 67, is a recess 18 (Fig. 4) at each side of the clearance 28. These recesses 18 are open ended to abut seat regions 19 (Fig. 3) of the plate 24. There is thus provided a yieldable coupling between the swingable plate 24 of fixed axis for the turret and the feeler controlled plate 69, for in each of the recesses 18 is a compression helical spring 80. The preferred practice is to locate a piece of work 51 to approximate the desired contact relation with the rotary tool 6, or I. The rough or preliminary adjustment is efiected by turning the crank [3, when the graduation marking 12 therefor is at the index H.

The screw 64 has a knurled The drum to be fitted by the particular brake shoe, or the master pattern 11, is engaged by the roller 14. The automatic response to the variations of the drum 11, whether over or under the original dimension, or special over or under, is automatically accounted for herein by the operator now operating the handle or crank l3 to locate the slot 28 with clearance each way from the axis 22.

I The operation Before starting the motor 3, the operator places an item of work 51 upon an appropriate dimension or sizebrake shoe support 53. In current motor vehicle internal drum brake friction face practice, the drum working face or inside diameter may run from six to twenty-four inches. A purpose herein is to reduce the special parts or fittings required for handling a wide range of sizes in the work. By noting the diameter for the face toward which the work 51 is to be thrown outwardly, the crank l3 may be operated to have the axis 22 approximate such radius as proper therefor. With the brake shoe 5'! contacting the idle tool 6, and with the plates 21 69, set for the clearance 28 to be snug against the axis shaft 22 on the side toward the tool and the clearance 10 snug against the shaft 22 opposite side, the action of the springs is nullified, and there may be swinging operation by the handle 30 movement to and fro. This swinging operation is in the slow steady driving to and fro by turning the crank 5| for an oscillation are one way and reversing for return; or there may be crank drive for cutting operation in one di-- rection, and the release or throw out for the worm 38 and the handle 30 used for the return, and then to continue the same direction of worm gear transmission as the worm be thrown back into mesh with the worm gear 33. The free swinging operation both ways by the handle 30 is with the worm 38 locked out of mesh by the trigger 43.

. For automatic accuracy of operation, a master or the drum H to have shoe fitted thereto, is mounted on the turret axis shaft 22. The feeler roller 14 is set to ride on the drum face. The crank I3 is set to adjust the clearance 28 clear of the shaft 22. As the roller 14 rides into larger internal diameter region of the drum '11, the work 51 is drawn away from the tool 6, or I, so that less stock be removed therefrom, thereby automatically compensating for the feeler control. When there be less internal diameter for the drum, more stock is taken from the brake shoe face.

What is claimed and it is desired to secure by Letters Patent is:

A machine for finishing segmental brake shoes having brake lining material on the peripheral surface thereof, comprising in combination, arotati ng cutter; a base having a horizontally extending guideway extending toward the cutter; a horizontally movable slide member mounted on the base and guided by the guideway, said base and slide member having nut and screw elements for moving the slide member along the base; a vertically extending post carried by the slide member; a turret head including a base mounted on said slide member, said turret head base having an opening receiving the post, said turret head base having a horizontally extending guideway, said turret head including a horizontally movable slide member mounted on the turret head guideway, and having an elongated opening receiving the post, said post being adapted to carry an arcuate guide member, the axis of the latter being coincident with the axis of the post; a brake shoe support carried by the second mentioned slide member for supporting a brake shoe with the brake lining thereon in cuttable relation with the cutter; a feeler carried by the second mentioned slide member in position to ride on the inner periphery of the arcuate guide member; a spring interposed between the turret head base and the second mentioned slide member yieldingly urging the feeler into engagement with the arcuate guide member; and means for oscillating the turret head base and second mentioned slide member about said post.

SYDNEY P. LOWE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,362,816 Olson Dec. 21, 1920 1,991,231 Shifiman Feb. 12, 1935 2,194,936 Hatch Mar. 26, 1940 2,304,530 Bigelow Dec. 8, 1942 2,325,826 Barrett Aug. 3, 1943 2,345,161 Thomason Mar. 28, 1944 2,365,078 Ho'ier Dec. 12, 1944 2,366,993 Antos Jan. 9, 1945 

